STUDY ON XINTAN LANDSLIDE IN THREE GORGE BASED ON DIGITAL LANDSLIDE TECHNIQUE

This paper uses the aerial images before and after the 6.12 Xintan Landslide and digital terrain as the information source. It adopts digital landslide technique, and takes a broader view of space-time. It aims to have more accurate geographical registration and more intuitive and clear expression. From the angle of one of the typical layer landslide types, it analyzes the characteristics of the 6.12 Xintan Landslide activities again in macro view. It suggests that the landslide is a piecewise partition activity. In the meantime, the size of each section, the activity way and the direction of each part are different. The landslide is driven by partition period of multistage movement. It is found that bedrock fissure control the landslide activities to a certain extent. Landslide activity of Jiangjiapo-Xintan slope can happen continuously and is difficult to stop completely. In addition to detailed investigation of geological environment of Xintan Landslide, the key method of digital landslide technique for identify initial failure of this type of layer landslide is to monitor the Jiangjiapo-Xintan slope. The main monitoring contents should include the follow three work. (1) The collapse activities of the main landslide material source areas, the change of the collapse debris accumulation below, and acquiring the warning(maximum) area size of the accumulate debris before slip. (2) The activities of each section on each stage, especially the activities of driving section. (3) The change of bedrock fissure shown on the debris accumulation slope. Because the geological and topography environment of Jiangjiapo-Xintan slope, long-term and successive monitoring is strongly recommended.